Leena Watts
Low-carb diets have been popular for decades, but the latest trend is a no-carb or zero-carb diet. This type of diet aims to eliminate carbohydrates from the diet as much as possible, which means cutting out whole grains, fruits, vegetables, milk, yogurt, beans, legumes, pasta, bread, and baked goods. While short-term carbohydrate restriction can lead to weight loss, there are concerns about the potential health risks of following this type of diet for longer periods. As carbohydrates are an essential macronutrient, it is generally not recommended that healthy adults completely cut them out. There is also limited research on the safety of no-carb diets, and they are not suitable for certain groups, including people with eating disorders, children, cholesterol hyper-responders, and pregnant or nursing people.
Is a no-carbohydrate diet safe?
| Characteristics | Values |
|---|---|
| Definition | A diet that eliminates digestible carbohydrates as much as possible. |
| Food Groups Avoided | Whole grains, fruits, vegetables, milk, yogurt, beans, legumes, pasta, bread, sugar-sweetened beverages, and starchy vegetables. |
| Food Groups Included | Meat, fish, eggs, cheese, oils, butter, nuts, seeds, and non-starchy vegetables. |
| Potential Benefits | Weight loss, lower risk of diabetes, and management of blood sugar levels. |
| Potential Risks | Increased LDL ("bad cholesterol"), kidney damage, osteoporosis, impaired physical activity, increased cancer risk, heart arrhythmias, cardiac contractile function impairment, and sudden death. |
| Other Considerations | Highly restrictive, may be difficult to sustain long-term, may not provide all essential nutrients, and may not be suitable for certain individuals (e.g., those with eating disorders, children, cholesterol hyper-responders, pregnant or nursing people). |
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What You'll Learn
Potential health complications
No-carb diets are highly restrictive and not well-researched for safety. They are not appropriate for people with eating disorders, children, cholesterol hyper-responders, and pregnant or nursing people.
- Fatigue and reduced athletic performance: Carbohydrates are the body's primary source of energy, and when you stop eating them, your body needs to find an alternative energy source. This can lead to feelings of tiredness and sluggishness, especially for those who are used to being active and exercising regularly.
- Increased "bad" cholesterol: Some research suggests that low-carb diets may increase LDL ("bad" cholesterol) due to the lack of fiber in such diets.
- Kidney damage: Some studies have linked long-term carbohydrate-restricted diets to kidney damage.
- Osteoporosis: There is some evidence that low-carb diets may contribute to osteoporosis, a condition that weakens the bones.
- Impaired physical activity: Following a no-carb diet over a long period may lead to impaired physical activity and reduced athletic performance.
- Increased cancer risk: Research shows that most people with restrictive eating patterns tend to eat fewer foods with phytochemicals, which offer cancer-protective factors.
- Nutrient deficiencies: A no-carb diet may lead to nutrient deficiencies, as it eliminates or strictly limits fruits, beans, vegetables, and whole grains, which are good sources of essential vitamins, minerals, and fiber.
- Weight regain: The weight loss associated with a no-carb diet is mostly water weight and glycogen loss. When you start eating carbs again, the water weight comes back, and you may experience weight regain.
- Other potential side effects: These include weakness, dizziness, headaches, stomach pain, nausea, and vomiting.
It is important to consult with a healthcare professional before starting any restrictive diet, such as a no-carb diet, to ensure it is safe and appropriate for your individual needs.
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Who should avoid a no-carb diet
A no-carb diet is an extreme version of a low-carb diet. It involves eliminating almost all carbohydrates, including whole grains, fruits, and starchy vegetables. While reducing carbohydrate intake can aid weight loss, a no-carb diet is highly restrictive and likely unnecessary.
As carbohydrates are a vital macronutrient, it is generally not recommended that healthy adults completely cut them out. They are the body's primary energy source, and without them, individuals may experience decreased energy levels, increased hunger, and difficulty concentrating.
- People with eating disorders: A no-carb diet is highly restrictive, and individuals with a history of eating disorders may be more susceptible to falling into unhealthy eating patterns or experiencing negative psychological effects.
- Children: Children require a balanced diet that includes carbohydrates for proper growth and development. A no-carb diet may deprive them of essential nutrients and energy needed for their growing bodies and brains.
- Pregnant or nursing individuals: Pregnancy and lactation are periods of increased nutritional demand. A no-carb diet may not provide the necessary nutrients for both the parent and the developing child, potentially impacting their health and well-being.
- Cholesterol hyper-responders: Some people may experience an increase in LDL ("bad") cholesterol levels when following a no-carb diet. If an individual is already prone to high cholesterol, this could exacerbate the issue and negatively impact their cardiovascular health.
- Individuals prone to kidney issues: Long-term carbohydrate restriction has been linked to kidney damage in some studies. Therefore, those who have existing kidney problems or are at high risk of developing them should exercise caution.
- Those at risk of osteoporosis: Some research suggests that low-carb diets may contribute to osteoporosis, or weakened bones. This makes the diet potentially harmful to those who are already at risk of bone health issues or who have a family history of osteoporosis.
- People with diabetes: While a no-carb diet can lower blood sugar levels, which may be beneficial for those with diabetes, it also carries the risk of hypoglycemia, or dangerously low blood sugar. Close medical supervision and medication adjustments are necessary for diabetics considering this diet.
- Athletes and highly active individuals: Carbohydrates are essential for athletic performance and sustained energy levels. A no-carb diet may negatively impact their endurance, strength, and overall athletic performance.
- Individuals prone to nutritional deficiencies: A no-carb diet may not provide sufficient vitamins and minerals, such as potassium, B vitamins, and vitamin C, which are abundant in carbohydrate-rich foods like fruits and vegetables. Over time, increased urination associated with low-carb diets can also lead to deficiencies in sodium and potassium.
- Those with a history of disordered eating or restrictive diets: Restrictive diets that eliminate entire food groups are challenging to sustain and can lead to an unhealthy relationship with food. Individuals prone to disordered eating patterns may find that a no-carb diet triggers or exacerbates these tendencies.
It is important to consult with a healthcare professional or a registered dietitian before starting a no-carb diet, as they can provide personalized advice and help mitigate potential risks.
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What foods can you eat
No-carb diets are very restrictive and are not recommended by nutritionists. Carbohydrates are essential for the body to function properly, and excluding them can be dangerous. They are one of the three main food types that the body needs to work properly, along with protein and fat.
If you are considering a no-carb diet, it is important to consult a doctor or nutritionist first. This is because a no-carb diet can be extremely challenging to follow long-term and could increase your risk of nutritional deficiencies.
However, if you are still considering a no-carb diet, it is important to know which foods you can eat. A no-carb diet focuses on eliminating all carb-containing foods and instead eating foods that contain mainly fat and protein. This includes meat, fish, poultry, pork, eggs, deli meats, cheese, fats, oils, and butter. Some no-carb dieters also include non-starchy vegetables such as greens, asparagus, cauliflower, and broccoli because they are low in net carbs. While these foods are not completely carbohydrate-free, they are very low in carbs and high in fiber. Additionally, nuts, avocado, and coconut are often included because they are very low in carbs.
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Weight loss
No-carbohydrate diets have gained popularity as a strategy for weight loss. However, it's important to understand the potential benefits and risks before adopting this dietary approach.
Firstly, it's worth noting that carbohydrates are one of the three macronutrients, along with fat and protein, that provide energy to the body. When you reduce your carb intake, you're likely to experience weight loss, at least in the short term. This initial weight loss is mostly due to fluid loss, as carbohydrates are stored with fluid in the body. Additionally, a no-carb diet may help you feel more full, leading to reduced calorie intake and further promoting weight loss.
However, it's important to approach no-carb diets with caution. They are highly restrictive and not well-researched for safety. There is limited evidence on the effectiveness of no-carb diets for weight loss, and they can be risky due to the important functions carbohydrates perform in the body. Carbohydrates have been blamed for the growing obesity problem, but the issue is often not the carbs themselves, but the type of carbs chosen. Refined carbs, for example, are easier to overeat and can lead to weight gain.
Instead of completely eliminating carbs, a more balanced approach is recommended. Gradually reducing carb intake and focusing on decreasing overall calorie consumption can be a less restrictive and healthier way to lose weight. Additionally, limiting added sugars and refined carbs can improve the quality of your diet.
If you're considering a no-carb diet, it's essential to consult with your doctor and be monitored by a healthcare professional. This type of diet may not be suitable for everyone, and there are potential health risks associated with long-term carbohydrate restriction, including heart arrhythmias, cardiac contractile function impairment, sudden death, osteoporosis, kidney damage, increased cancer risk, and more.
In conclusion, while a no-carb diet may lead to initial weight loss, it is not a well-researched or recommended approach due to the risks involved and the limited evidence of its long-term effectiveness. A more balanced and gradual approach to reducing carb intake, along with overall calorie intake, is generally a safer and healthier strategy for weight loss.
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Energy levels
Carbohydrates are a basic nutrient that the body turns into glucose, or blood sugar, to make energy for the body to work. As a result, carbs are the body's primary source of energy. A no-carb diet, therefore, may reduce energy levels.
When the body does not have enough sugar to run on, it starts to use fat as its main source of energy. This causes the liver to make chemicals called ketones, which the body can use as fuel. This process is called nutritional ketosis. Nutritional ketosis can be induced when carb intake is limited to less than 10% of macronutrient intake, or 20 to 50 grams of carbohydrates per day.
However, ketosis can lead to weakness, fatigue, dizziness, and headaches, which can feel a lot like flu symptoms. More serious side effects can include stomach pain, nausea, and vomiting. These symptoms are thought to be caused by not getting enough nutrients from fruits, beans, veggies, and whole grains—foods that are not allowed, or are strictly limited, on a no-carb diet.
There are also anecdotal reports of improved energy levels, better cognition, and improved mood among people with low- or very low-carb diets. However, there is no evidence from large studies to support these claims.
While a no-carb diet may not be safe for everyone, it is important to consult a healthcare provider before making any dietary changes.
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Frequently asked questions
A no-carb or zero-carb diet is an extreme version of a low-carb diet. It aims to eliminate carbohydrates from the diet completely. Instead, no-carb dieters can choose from mostly animal products like meat, fish, eggs, and cheese. Some proponents of the diet also allow for leafy greens like spinach and lettuce.
A no-carb diet is highly restrictive and not well-researched for safety. It is not appropriate for those with eating disorders, children, cholesterol hyper-responders, and pregnant or nursing people. Some studies have linked low-carb diets to increased mortality, higher levels of "bad cholesterol", and long-term complications like kidney damage, osteoporosis, and impaired physical activity.
As carbohydrates are an essential macronutrient, it is likely that you will have less energy if you stop eating them. You may feel more tired and hungry and may find it difficult to perform athletically. Ketosis, a process that occurs when the body switches to breaking down fat into ketones, can lead to weakness, fatigue, dizziness, and headaches.
